what sort of power are you going to be pulling?
If you are geared remember that the force at the clutch/engine interface will possibly be less than stock. When I built my zook, mid range cam, bigger carby, modded intake, extractors with 34" swampers, 4.57 diff gears and 4.9 TT tranny i just dropped a standard clutch in. It never had an issue at all. All the stress will be further down the driveline --> driveshafts, R&P, axles, cvs etc.
Although if you are producing some serious power then you might want to upgrade
